Ignition-plug.



No. 806,017. `I ATBNTED Nov. 28.1905."

G. I'. SPLITDORF.

IGNITION PLUG.

APPLICATION FILED MAEJ. 1903.

, n IumlnlllllumlmlmnHumm A M lll To '(1,25 whom tl may concern:

l UNITED STATES PATENT.' 'OFFICEA l CHARLES E. SPLITDORF, OE- NEw YORK, N. Y., ASSICNOR To iELECTRIC VEHICLE COMPANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

IGNITION-PLUG.. ,f

Application filed March 7, 1903. Serial No. 146,778.

Be it known that I, CHARLES F. SPLITDORF,

' a citizen ofthe United States, residing in the borough of Manhattam'in' the city, county, and State of New York, have invented a new rated in its structure the provision of a gap or air-space intermediate the secondary terminal and the insulated electrode within the plug which terminates in one of the sparkpoints.

My invention further includes means forv In the construction illustrated A indicatesy the usual bushing inserted within the combustion-chamber of an explosive-engine, the

wall of the latter, broken away, bein indicated at A. Also for the purpose o illus-l tration a binding-post, as a, is indicated as containing a terminal a of the secondary circuit B of an induction-coil, the latter being:

diagrammatically represented at B. i

A2 indicates the usual tubular-threaded portion, which is screwed into bushing A and is provided at its inner end .with the elec-I trode a2.

The threaded sleeve A3 is screwed upon the tubular portion A2 to secure the connection of the lu within the bushing.

C indicates t e ug-conductor or conducting-rod bearing t e electrode c and having the porcelain or other insulating-envelop D'. The parts so far described are substantially as usually employed in the construction of sparking plugs, and the means of making e ectrical connection between the secondary terminal and the spark-plug electrode consist in securing said terminal in a bindingpost which is attached at the outer end of said electrode. In my improved construcwithin the combustion-c tion for effecting such electrical connection I provide means in the construction. of the terminal binding-post whereby in the adjustment thereof upon the plug an airspace is left between the electrodes, such air-space 'serving as a spark-gapto be trasversed by the electric current in completing the circuit.- In my improved construction for the production of sai spark-gap I employ an exteriorly- Patented Nov. 28, 1905. 5

threaded collar F, mounted upon the outer end of insulation D and iirmly secured thereto by-being spun into the annular recess d.

G indicates an end cap from which extends 'the binding-post g, having transverse a erture g to receive the terminal b, whic is firmly held therein by screw g2. Said cap A vmember G is hollowed at its opposite end, be-

ing interiorly threaded to permit of its adjustment upon the threaded collar F, the interior of its cavity being exposed to the atmosphere by means of opening g3, formed through the-material of the cap. The interior surface of the cavity in cap- G opposite the outer end of electrode C is concaved, so

as to be removed from contact with said elec'- trode, and the degree or extent of space formed between the spark-point g4L on said surface and the electrode C to regulate the spark-gap is determined by the adjustment of the screw connection between cap G and collar F.

The effect of introducing the aforesaid auxiliary spark-gap in the secondary circuit, either in one of the forms hereinbefore `described or in other equivalent constructions, is to intensify the inductive influence of the coil, causing the discharg at the spark-points amber to have a potential greatly in excess .of that hitherto attainable, insuring the production of sparking between Said spark-points even when the lat- IOO riorly-threaded collar about the outer end of said envelop, an open metallic cap adjustably p screwed upon said collar to provide an airspace between said cap and electrode, and a binding-post upon said cap, a terminal ofthe circuit being connected to said binding-post.

3. Sparking mechanism comprising a plug with a pair of electrodes or terminals at each of two separate portions thereof to form spark gaps, and provisions whereby said plug may be attached to an engine-cylinder with one pair of terminals visible.

4. Sparking mechanism comprising a plug with electrodes or terminals at each end to form spark-gaps.

5. A plug for combustion-engines, having a plurality of pairs of stationary electrodes,

each forming a spark-gap, and means whereby said plug may be secured to an engine with one pair of electrodes in active igniting position, and the other pair visible.

6. Sparking mechanism `for combustionengines having two stationary sparking gaps in series in stationary relationship, one of said spark-gaps being located within the engine-cylinder, and the other outside the same.

7. An igniting mechanism for combustionengines comprising a circuit having two pairs of stationary electrodes or terminals in scries, each pair separated to form a spark-gap, one pair of electrodes or terminals being located within the cylinder and the other being located externally thereto in position to bc observed by the operator.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 2d. day of March, 1903.

CHARLES F. SPLITDORF.

Witnesses:

NAT B. CHADsEY, Jr., NATHAN B. CHADSEY. 

